Asymmetric Synthesis XXIII.1A 100% cis Diastereoselectivity in the SYnthesis of Enantiomerically Pure 2,6-Dialkylpiperidines

Abstract
Enantiomerically pure (+)-(2S,6R)-2-propyl-6-methyl-piperidine 6 has been obtained in 4 steps, 66% overall yield and without separation of diastereomers from the chiral 2-cyano-6-oxazolopiperidine synthon 1c derived from (+)-1,2-diphenyl-2-aminoethanol